Device for replacing fuze parts



A. J. GRANDY DEVICE FOR REPLACING FUZE PARTS May 9, 1961 Filed Feb. 25, 1959 II II u 1 I1 1 VV INVENTOR. ANDREW J. GRANDY BYX 42.5. Q MYV QJ MM ATTORNEYS! FIG.2.

" V detent.

. to seat the fuze.

ited? SW8 Pa n .9 4 DEVICE FOR REPLACING FUZE PARTS Andrew J. Grandy, North Hills, Pa., assignor to the United States of America as represented by the Secretary of the Army Filed Feb. 25, :1959, Ser. No. 795,568

' 4 Claims. c1. 73-167) (Granted under Title 35, U8. Code 1952 sec. 266) The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment to me of any royalty thereon.

which engages the head arms pin when'it is alined therewith.

7 and a slight rotation of thefuze disengages the head of This invention relates to the inspection or repair of travelled a predetermined distance. The principal object of the invention is to provide a device whereby the boresafety pin may be removed from the fuze more safely and with less etlfect than has been possible in the past.

in the field maintenance of such fuzes, it is sometimes desirable toinspect the bore safety pin or to replace it by another adapted to provide a dilierent time delay between the firingof the projectile and the arming of the fuze.

-Heretofore this operation has involved removal of the fuze from the projectile, removal of the booster, unstaking and removal of a slider, unstaking and removal of a slider 'detent, and'unstaking and removal of a bore safety pin The device of the present invention eliminates most or all of these steps by (l) depressing the firing pin to lock parts otherwise released by a removal of the boresafety pin and (2) energizing an electromagnet whereby the set-back pin is disengaged from the bore-safety pin.

The invention will be better understood from the following description when considered in connection with the accompanying drawings and its scope is indicated by the appended claims.

Referring to the drawings:

ll' ig. 1 illustrates the invention as applied to a fuze which has been removed from the projectile, and

Fig. 2 shows it as applied to a fuze which is fixed to a' projectile.

The fuze is a conventional type which includes a boresafety pin 10, a set-back pin 11 which is biased into a slot in the pin 10 bya spring 12, and a slider 13 which rides i in an aperture 14 and is backed in its illustrated position by the pin 10. The slider 13 bears a primer (not shown) spring 317 which. is compressed to bring the firing pin 5 into contact with the primer upon impact of the projectile against the target. The aperture 16 leads from the primer projectile is ignited.

the pin 10 from the projection 25 so that it may be forced out by a spring 26.

Under these conditions, the pin 10 may be inspected and reinserted Also it may be replaced by a new pin or a pin providinga difierent time delay between the firing and arming of the projectile. In any case, a slight rotation of the fuze brings the pins head into engagement with the projection so that it is properly positioned in the fuze.

Raising the arm 23 successively deenergizesthe electromagnet 18-1 and releases the pressure on the nose of the fuze. Deenergization of the electromagnet allows the set-back pin 11 to interlock with the bore-safety pin 16. Release of the pressure on the nose of the fuze allows the spring 17 to detach the firing pin 15 from the slider 13. This puts the fuze into operative condition.

Fig. 2 illustrates a form of the invention which is adapted for use with a fuzefixed to a projectile. In this case, an annular electromagnet 26 is supported on an annular base 27, the opening through the electromagnet and base being of a size to receive a projectile body 28.

The operation of this modification of the invention is the same as that previously described.

I claim: I l. Incombination with a fiuzehaving a bore-safety pin which is locked in place by a set-back pin and is interlocked with a slider arranged to move a primer into alignment with a firing pin and wherein a nose in the fuze is adapted to cooperate in attaching and detaching the firing pin from the slider, the combination therewith of a device attachable to said fuze during an inspection of said bore safety pin and removable therefrom subsequent to said inspection comprising an electromagnet disposed axially rearwardly adjacent of said fuze, an arm extending outwardly from said elect-romagnet and integral therewith, a current supply in circuit with said electromagnet, an L-shaped control lever exteriorly of said fuze and. articulating between said nose and said arm, a pair of spaced electrical contacts fixed on said arm and interrupting said circuit, an electric contact extending from said lever for engaging said fixed contacts to close said circuit and energize the electromagnet when thelever is in a depressed position, said depressed lever 'general lysimultaneously urging thenose inwardly of said fuze for detaching the firing pin from the slider.

2. A device as described in claim 1 further characterized by said arm having a slot therein for guiding the movement of said control lever.

3. The device ofclaim 1 further characterized byan abutment on said lever for engaging a bore safety pin head to prevent the ejection of the bore-safety pin from said fuze.

The device for removing the bore-safety pin 10 and from the fuze includes an electro-rnagnet which has a winding 18 and a core 19 with its upper surface arnanged Through input leads 20, a switch formed bypfi xed contacts 21 and a movable contact 22, current is supplied to the coil 18 when the switch 21--22. is closed.

.Operation of this switch iseffectedby an l.' -shaped control member 23 which rides in aslot in an extension 24 fixed to-the core'19. The arm 23 has a projection 25 outwardly from said core and integral therewith, a current I 4. In combination with a fuze separated from its projectile, said fuze having a bore-safety pin which 'islocked inrsaid fuze by a set-back pin and is interlocked with a slider arranged to move a primer into alignmentwith a firing pin and wherein a nose in the fuze isadapted tocooperate in attaching and detaching the firing pin from the slider, the combination therewith of a device attachwinding therearound, said core providing a surface. at an upper end for seating thefuze thereon, an arm extending i d M y 9.196

supply in circuit with said electromagnet, an L-shaped control lever exteriorly of said fuze and articulating be tween said nose and said arrn, a pair of spaced electrical a s fixed Q Said arm and nterr ti g, sa d irwi an electric contact extending from said lever forengaging said fixed contacts to close said circuit and energize the electromagnet when the lever is in a depressed position, said depressed lever simultaneously urging the nose inwardly of said fuze for detaching the firing pin from the slider,

t 4 References Cited in the file of this patent UNITED STATES PATENTS Teitscheid Oct. 9, 1934 Geitmannea. May 21, 1935 Funk et a1. June 7, 1955 Thomas July 29, 1958 a i i F. 

